Astronomy Picture of the Day . ... 13.09.1998 . ... Galileo quickly discovered that our Moon had craters , that Jupiter had its own moons , that the Sun has spots , and that Venus has phases like our Moon. ... Galileo claimed that his observations only made sense if all the planets revolved around the Sun , as championed by Aristarchus and Copernicus , not the Earth , as was commonly believed then. ... Publications with keywords: Galileo - telescope . Publications with words: Galileo - telescope . ...